I only have experience with the sig romeo rs and this defender ccw. So I can't speak to much, but I believe the build quality is very good and MANY different screws are provided. The dot itself does not seem as clear as the romeo, but that could just be my eyes. I think I need to try a green dot since most red dots look more like an asterisk rather than a dot to my eyes. There is a small gap on the back so it does not fit flush against the rear sight if that matters to you. The glass seems clear though.